Fix spelling errors.

[sebastic]

The lintian QA tool reported several spelling errors:

• Phillipines -> Philippines
• availabe -> available
• Ammount -> Amount
• initilizing -> initializing
• Unknow -> Unknown
• direcories -> directories
• Defualt -> Default
• prefered -> preferred
• repaced -> replaced
• explicitely -> explicitly
• constrast -> contrast
• seperated -> separated
• avaliable -> available

[gpotts]

Thank you for the pull request